yuan1 = ('a','b','c','d','e','f')
print(yuan1[0])
print(yuan1[0:3])
print(yuan1[::-1])
print(yuan1[2:5])
yuan2=('g','h')
print(yuan1 +yuan2)
print(yuan2 * 3)
print("a" in yuan1)
print("a" in yuan2)